JP5152226B2 - Electric blower and electric vacuum cleaner using the same - Google Patents

Description

  The present invention relates to an electric blower and a vacuum cleaner.

  Conventionally, as this type of electric blower, as shown in FIG. 13, an electric motor 2 having a rotating shaft 1, an impeller 4 fixed to the rotating shaft 1 by a nut 3 and driven to rotate by the electric motor 2, and discharged from the impeller 4 There are air guides 5 for converting the energy of the flow velocity of the generated air into energy of pressure, and the fan case 6 containing the impeller 4 and the air guide 5.

  Details of the impeller 4 will be described with reference to FIG. The impeller 4 includes a sheet metal rear shroud 11, a sheet metal front shroud 12 spaced apart from the rear shroud 11, and a plurality of sheet metal blades 13 sandwiched between the pair of shrouds 11 and 12. , And a resin inducer 15 provided corresponding to the air inlet 14 provided in the center of the front shroud 12. The sheet metal blade 13 is attached to the shrouds 11 and 12 by caulking. The resin inducer 15 is composed of a substantially conical hub 16 and a blade portion 17 formed on the hub 16, and in particular, to rectify the air flowing from the intake port 14 to the sheet metal blade 13 side, The shape of the blade portion 17 is a shape having a three-dimensional curved surface.

  FIGS. 15A and 15B show the mold structure of the inducer 15. In order to create the inducer 15 having such a complicated shape, resin molding is performed using a side slide mold 21 that slides radially toward the outer periphery of the inducer blade portion 17. The molding die is composed of the same number of side slide molds 21, cores 22, and cavities 23 as the blade portions 17 (see, for example, Patent Document 1).

  Further, as shown in FIG. 16, the inducer 31 is divided into an upper part and a lower part of an inducer A31a and an inducer B31b, and a structure in which the inducer A31a and the inducer B31b are fastened to the rotary shaft 33 by a nut 32 and fixed. Yes (see, for example, Patent Document 2).

  Also, as shown in FIGS. 17A and 17B, the inducer 41 has a vertically divided structure of an inducer A41a and an inducer B41b, and a recess 43 is provided in a blade portion A42a of the inducer A41a, whereby the inducer B41b. There is also a configuration in which the inducer A 41 a and the inducer B 41 b are fixed by providing a convex portion 44 on the blade portion 42 b and fitting the concave portion 43 and the convex portion 44 by shrink fitting (for example, Patent Document 3).

JP 2000-45993 A JP 59-103999 A Japanese Patent Laid-Open No. 5-149103

However, in Patent Document 1 at that time, the number of blades is considered to be optimal from the relationship between the number of blades and the fan efficiency. However, depending on the aim of the air volume and the number of rotations, the number of blades may exceed six. A desirable case is also conceivable. In addition, high-frequency sound, which is a kind of noise generated by an electric blower, is prominently generated at a frequency that is an integral multiple of the product of the number of blades and the number of rotations. Since a plurality of frequencies that are integral multiples of the product of the number of sheets and the number of rotations are included, it is annoying, and increasing the number of blades is considered as a means for reducing noise. However, when the number of blades exceeds 6, or when the inlet angle of the blades is small, that is, when the blades are sleeping, the blades of adjacent inducers overlap, and FIGS. 15 (a) and 15 (b) In the radial slide core as shown in FIG. 1, since the molding was impossible, there was a problem that the shape was greatly limited.

  Further, in the conventional configuration shown in FIG. 16, even when the number of blades of the inducer is increased, the inducer is composed of two upper and lower parts, so that molding is possible. Since the inducer B is fastened together and fixed, the tightening force of the nut is also applied to the inducer A. For this reason, if the thickness of the inducer A is not secured to some extent, the inducer A may be damaged, and therefore the inducer A cannot be thinned. When the thickness of the inducer A is increased, the pressure surface at the blade portion A of the inducer A is increased, so that force is applied to the root portion of the blade portion A due to air resistance, so that the vicinity of the root portion of the blade portion A is increased. As a result, there is a problem that the flow passage area in the inducer is narrowed and the blowing efficiency is lowered.

  Further, since the thickness of the inducer A is large, when the number of blades is large or when the blade entrance angle is small, the blade portion A overlaps in the vertical direction. There was also a problem that it was impossible to mold with a mold. Furthermore, there was no prevention means for the blade portion A to be displaced in the direction of the rotation axis or in the circumferential direction of the rotation axis.

  And in the said conventional structure shown to Fig.17 (a), (b), since it is the structure which fixes the inducer A and the inducer B by shrink fitting, the inducer A can be made thin, Since the resin cannot be used, it has a problem that it is not suitable for mass-produced products.

  In addition, the inducer A is prevented from shifting in the circumferential direction of the rotating shaft by fitting the concave portion and the convex portion, but in the direction of the rotating shaft, the inducer B side has the blade portion A and the blade portion. Although the shift can be prevented by hitting B, the shift may occur when a force is applied to the opposite side.

  In particular, when an inducer having such a configuration is used for an electric blower such as a vacuum cleaner, the reverse side of the inducer B, that is, the suction side of the electric blower becomes negative pressure, so the inducer A is on the suction side. Due to the pulling, there is a problem that the mating surfaces of the inducer A and the inducer B are displaced in the direction of the rotation axis.

  The present invention solves the above-described conventional problems, and provides an electric blower with high blowing efficiency and low noise by realizing a multi-blade resin-made inducer that can be mass-produced with a simple mold configuration. The purpose is to do.

In order to solve the conventional problem, the electric blower of the present invention and a vacuum cleaner using the same are as follows:
An electric motor having a rotating shaft, an impeller that is rotationally driven by the electric motor, and the impeller includes a front shroud having an air inlet, a rear shroud spaced from the front shroud, and the pair of shrouds A plurality of sheet metal blades sandwiched between and a resin inducer that is provided at the center of the impeller and has a substantially conical hub portion and a plurality of wing portions around it, and rectifies the intake airflow The inducer is divided into two parts on a surface substantially perpendicular to the rotating shaft of the motor, and the inducer A on the front shroud side includes a substantially ring-shaped hub portion A and a plurality of hubs A. The rear shroud-side inducer B is composed of a substantially conical hub portion B and a plurality of wing portions B. The wing portion B and the wing portion A include Join each other's wings Engaging portions are provided on the mating surfaces, the hub portion A is inserted into the outer periphery of the hub portion B, and the inducer B is fixed to the rotating shaft by a fastening body from above the hub portion B. The wing part B and the wing part A are connected by the engaging part, and the inducer A has a wing tip in the outer peripheral direction of the wing part A disposed close to the front shroud, and the hub. By disposing the upper surface portion of the portion A so as to be covered close to the lower surface portion of the fastening body, the movement in the rotation axis direction is restricted.

  As a result, when fixing the impeller to the rotating shaft with a fastening body such as a nut, no force is applied only to the hub portion A of the inducer A. Since the possibility of breakage due to force can be greatly reduced, it is possible to realize a multi-blade resin inducer that can be mass-produced with a simple mold configuration.

  Further, the configuration in which the wing part B and the wing part A are coupled by the engaging part prevents the rotation shaft from moving in the circumferential direction, and the wing tip in the outer circumferential direction of the wing part A is connected to the front shroud. Since the movement in the direction of the rotation axis is restricted by disposing the hub portion A so that the upper surface portion of the hub portion A is covered close to the lower surface portion of the fastening body, the wing portion B and the wing blade Problems such as turbulence of the air flow due to deviation of the portion A and breakage of the wing portion can be avoided.

  And the vacuum cleaner using this electric blower is very practical with high ventilation efficiency, strong suction, and low noise.

  In the electric blower of the present invention and the vacuum cleaner using the electric blower, the inducer is composed of two upper and lower parts, the hub part A is inserted into the outer periphery of the hub part B, and the inducer B is attached from the upper part of the hub part B by the fastening body. When the impeller is fixed to the rotating shaft with a fastening body such as a nut by arranging the hub portion A so that the upper surface portion of the hub portion A is covered close to the lower surface portion of the fastening body. In addition, it is possible to prevent the tightening force from being applied only to the inducer A on the front shroud side, and the inducer A can be made thin, so that it is made of resin that can be mass-produced with a simple mold configuration. A multi-wing inducer can be realized. The inducer B is fixed to the rotating shaft with a nut, and the inducer A is provided with means for preventing or restricting movement in both the rotating shaft direction and the circumferential direction of the rotating shaft. It is possible to avoid problems caused by the deviation.

The fragmentary sectional view of the side surface of the electric blower which shows the 1st Embodiment of this invention Partial sectional view of the impeller of the electric blower Perspective view of the inducer of the electric blower Rear perspective view of inducer A of the same electric blower (A) The top view which shows the metal mold | die structure of the inducer B of the electric blower (b) The side view which shows the metal mold | die structure of the inducer B of the electric blower (A) Top view of the inducer A of the electric blower (b) Side view showing the mold configuration of the inducer A of the electric blower Cross section of the wing part of the electric blower The perspective view of the inducer of the electric blower which shows the 2nd Embodiment of this invention Rear perspective view of inducer A of the same electric blower The perspective view of the inducer of the electric blower which shows the 3rd Embodiment of this invention Rear perspective view of inducer A of the same electric blower Whole block diagram of the vacuum cleaner which shows the 4th Embodiment of this invention Partial sectional view of a conventional electric blower Partial sectional view of the impeller of the electric blower (A) The top view which shows the metal mold | die structure of the inducer of the electric blower (b) The side view which shows the metal mold | die structure of the inducer of the electric blower Partial sectional view of another form of the electric blower (A) Sectional drawing of the inducer of another form of the electric blower (b) XX sectional view of the inducer of the electric blower

  1st invention is equipped with the electric motor which has a rotating shaft, the impeller rotated by the said electric motor, the front shroud which has the said impeller with an inlet, and the rear surface shroud distribute | arranged with this front shroud at intervals. A plurality of sheet metal blades sandwiched between the pair of shrouds and a substantially conical hub portion and a plurality of wing portions around the blade, and the intake airflow The inducer is divided into two parts on a surface substantially perpendicular to the rotating shaft of the electric motor, and the upstream inducer A is a substantially ring-shaped hub. The downstream side inducer B is composed of a substantially conical hub portion B and a plurality of wing portions B. The wing portion B and the wing portion A are composed of a portion A and a plurality of wing portions A. Has an engaging part that matches each other's wings. The wing portion B and the wing portion B are respectively provided on the mating surfaces, and the hub portion A is inserted into the outer periphery of the hub portion B, and the inducer B is fixed to the rotating shaft by a fastening body from above the hub portion B. The wing part A is configured to be connected by the engaging part, and the inducer A has a wing tip in the outer peripheral direction of the wing part A arranged close to the front shroud, and an upper surface part of the hub part A Since the movement in the direction of the rotation axis is restricted by disposing it so as to be covered close to the lower surface portion of the fastening body, the inducer A can be made thin. It is possible to realize a multi-blade resin inducer that can be mass-produced with a simple mold configuration. The inducer B is fixed to the rotating shaft with a fastening body, and the inducer A is provided with means for preventing or restricting movement in both the rotating shaft direction and the circumferential direction of the rotating shaft. It is possible to avoid a problem caused by shifting.

  According to a second aspect of the invention, in particular, in the first aspect of the invention, the engaging portion is a stepped portion configured such that a convex portion is provided on the suction surface side of the wing portion B, so that the wing portion is caused by air resistance. It becomes possible to prevent A from moving in the direction opposite to the rotation direction.

  In particular, the third invention is the inducer A in the second invention, wherein a part of the engaging portion is a stepped portion configured to be provided with a convex portion on the pressure surface side of the wing portion B. When the inducer B is assembled, the wing part A can be used as a positioning means for preventing the wing part A from shifting in the rotational direction with respect to the wing part B.

  According to a fourth aspect of the invention, in particular, in the first aspect of the invention, the engaging portion includes a first step portion configured such that a convex portion is provided on the outer pressure side of the wing portion B, and an inner portion of the wing portion B. When the inducer A and the inducer B are assembled, the position is determined by each blade when the second stepped portion is configured such that the convex portion is provided on the circumferential pressure surface side. And the wing part B will not be offset and assembled. Further, since the engaging portions of the wings A and B can have the same shape, the molding accuracy can be increased as compared with the case of the third invention.

  In a fifth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, the mating surface in the circumferential direction with respect to the rotation axis of the engaging portion is configured to be substantially vertical, so that the circumferential direction is Even when a force is applied, the force is not dispersed in the rotation axis direction, so that the wing part A and the wing part B can be prevented from being displaced in the rotation axis direction.

  In a sixth aspect of the invention, in particular, in any one of the first to fifth aspects of the invention, an uneven engaging portion having a tapered portion is provided on the mating surface in the rotation axis direction of the hub portion A and the hub portion B. Because the upper end surface is higher than the engagement portion provided on the mating surface of the part A and the wing part B, when the inducer A and the inducer B are assembled, the position is likely to be shifted slightly. However, since the taper portion guides to a predetermined position, the assemblability is improved.

  The seventh aspect of the invention is particularly practical because it is a vacuum cleaner having the electric blower according to any one of the first to sixth aspects of the invention, and has high blowing efficiency, strong suction force, and low noise. You can get a vacuum cleaner.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 to 7 show an electric blower according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the electric motor 102 is arrange | positioned at the electric blower 101 in this Embodiment. The electric motor 102 is a type of motor called a brush motor, and includes a rotor part 103, a stator part 104, a bracket 105 and a brush part 106 covering them, and the brush part 106 is located below the rotor part 103 and the stator part 104. Is provided. The rotor part 103 is provided with a rotating shaft 107, a commutator part 108, and coil parts 109a and 109b, and the stator part 104 is also provided with coil parts 111a and 111b. The impeller 120 is connected to the rotating shaft 107 by a nut 112.

  As shown in FIG. 2, the impeller 120 is sandwiched between a sheet metal rear shroud 121, a sheet metal front shroud 122 spaced apart from the rear shroud 121, and a pair of shrouds 121, 122. A sheet metal blade 123 and a resin inducer 125 provided corresponding to an air inlet 124 provided in the center of the front shroud 122 are configured. The sheet metal blade 123 is attached to the shrouds 121 and 122 by caulking. The resin inducer 125 includes a substantially conical hub portion 126 and nine blade portions 127.

  Since the number of the wing parts 127 is as large as nine in this way, adjacent wings overlap each other, and a mold using a conventional slide core has a shape that cannot be molded. Therefore, as shown in FIGS. 3 and 4, the inducer 125 is divided into two parts on a plane substantially parallel to the rear shroud 121, and is composed of an upstream part inducer A 125a and a downstream part inducer B 125b. ing.

  Here, the mold structure of the inducer B125b will be described with reference to FIGS. FIG. 5A is a plan view of the inducer B 125b and its mold configuration as viewed from the intake port 124 side, and FIG. 5B is a cross-sectional view thereof. As shown in these figures, the slide mold 131 is configured with nine-direction slide molds 131 formed at 40-degree angular intervals, a core 132, and a cavity 133. The inducer 125 is divided into two parts, an inducer A 125a and an inducer B 125b, so that adjacent wing parts B127b of the inducer B 125b do not overlap each other, and therefore, as shown in FIGS. 5 (a) and 5 (b). With such a simple mold structure, it can be molded.

Next, the mold structure of the inducer A125a will be described with reference to FIGS. FIG. 6A is a plan view of the inducer A 125a as seen from the intake port 124 side, and FIG. 6B is a cross-sectional view showing the inducer A 125a and its mold configuration. The inducer A is composed of the simplest two-plate mold of the core 134 and the cavity 135.

  Thus, the inducer 125 is composed of nine blades, which is larger than the six blades of the conventional example, and thus cannot be molded as it is, but the inducer A 125a and the inducer B 125b By dividing into two parts, a resin inducer that can be mass-produced with a simple mold configuration can be realized.

  Further, as shown in FIG. 7, the inducer A 125a and the inducer B 125b are provided with stepped step portions 143a, 143a on the mating surfaces 141a and 141b of the wing portion 127a of the inducer A 125a and the wing portion 127b of the inducer B 125b. 143b is provided. The step portions 143a and 143b are configured such that a convex portion 145 is provided on the suction surface 144 side of the wing portion B127b. Here, the mating surfaces 146a and 146b in the circumferential direction of the stepped portions 143a and 143b with respect to the rotating shaft 107 are configured so as to be aligned with substantially vertical surfaces without providing a taper.

  Further, as shown in FIGS. 3 and 4, the hub portion A126a of the inducer A125a and the hub portion 126b of the inducer B125b are provided with a plurality of engaging portions 148a and 148b having tapered portions 147a and 147b on both sides. The height of the engaging portions 148a and 148b in the direction of the rotating shaft 107 is configured to be higher than the height of the step portions 143a and 143b provided on the wing portions 127a and 127b.

  The inducer A125a is assembled by inserting the hub portion A126a into the outer peripheral side of the cylindrical portion 149 provided in the hub portion 126b of the inducer B125b. At this time, even if the position is slightly deviated, the taper portions 147a and 147b provided in the engaging portions 148a and 148b are guided to predetermined positions, so that the assemblability can be significantly increased.

  The impeller 120 is formed by assembling the inducer 125, the respective shrouds 121 and 122 made of sheet metal, and the blade 123, and caulking the blade 123. Here, by configuring the outer diameters of the inducer A 125 a and the inducer B 125 b to be larger than the inner diameter of the intake port 124 provided in the center of the front shroud 122, the inducer A 125 a and the inducer B 125 b are configured from the intake port 124. Will not come out.

  Further, by arranging the blade tip 150 in the outer circumferential direction of the blade portion A127a of the inducer A125a close to the lower surface portion 151 of the front shroud 122, the blade portion A127a is displaced in the axial direction of the rotating shaft 107. It is regulated.

  In addition, if there is a gap between the blade 123 and each shroud 121, 122, and between the inducer A 125a, inducer B 125b, and each shroud 121, 122, air leaks from the gap. Therefore, it is desirable to fill these gaps with an adhesive or painting. More preferably, it is desirable to fill the space between the inducer A 125a and the inducer B 125b with an adhesive or the like.

  The impeller 120 assembled in this way is attached to the rotating shaft 107 by a nut 112. Here, the nut 112 does not apply a fastening force only to the hub portion A126a of the inducer A125a, that is, a force is simultaneously applied to the hub portion A126a of the inducer A125a and the cylindrical portion 149 of the inducer B125b. Alternatively, the upper surface portion 152 of the hub portion A 126a and the lower surface portion 153 of the nut 112 are close to each other, that is, the height of the cylindrical portion 149 is equal to the height of the hub portion A 126a, or the cylindrical portion 149 is applied. Is configured to be slightly longer.

  Further, by making the outer diameter of the nut 112 larger than the inner diameter of the hub portion A 126a, more preferably, equal to the outer diameter of the hub portion A 126a, the hub portion A 126a extends from the hub portion B 126b in the axial direction of the rotary shaft 107. It can be prevented from coming off.

  As a result, even if the axial thickness of the rotating shaft 107 of the inducer A125a is reduced, the inducer A125a can be prevented from being damaged by the fastening force of the nut 112. Since it is possible to reduce the thickness of the inducer A125a, the surface area of the wing portion A127a can be reduced, so that the force applied to the pressure surface 154 can be reduced, so that the root portion 155 of the wing portion A127a is strengthened. There is no need to make it thicker for securing.

  Therefore, it is possible to secure a sufficient flow path area inside the inducer A 125a, and it is easy to improve the blowing efficiency. Further, even when the number of the wing parts 127 is large or the inlet tip inflow angle of the wing part A 127a is small, the inducer A 125a can be made thin, so that the wing part 127a is viewed from the axial direction of the rotary shaft 107. Therefore, the inducer A 125a can be formed by a simple two-plate mold having a core 134 and a cavity 135 as shown in FIGS. 6 (a) and 6 (b).

  An air guide 161 is provided around the impeller 120. This is to gradually reduce the flow velocity of the air discharged from the impeller 120, thereby converting the energy of the flow velocity into the energy of pressure and improving the blowing efficiency. The impeller 120 and the air guide 161 are enclosed by a metal fan case 162. The fan case 162 is integrally formed with a resin fan case spacer 163. The fan case spacer 163 is in contact with and sealed against the front shroud 122, and the air discharged from the impeller 120 is again taken into the intake port 124. It is comprised so that it may not flow into the impeller 120 inside.

  About the electric blower comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the electric blower 101 is activated, the rotor portion 103 of the electric motor 102 rotates, and the rotary shaft 107 rotates accordingly, and the impeller 120 attached to the rotary shaft 107 by the nut 112 is in the direction of arrow Z in FIG. Rotate to. At this time, a force in the direction opposite to the rotation direction of the impeller 120 is generated on the pressure surface 154 of the wing 127 due to the resistance of air. The inducer B 125b is fixed to the rotating shaft 107 by the fastening force of the nut 112, but the inducer A 125a may be damaged when a strong fastening force by the nut 112 is applied. Therefore, when force is applied to the pressure surface 154, There is a possibility that the positions of the mating surfaces 141a and 141b with the inducer B125b are shifted, and the flow of air is disturbed to cause loss.

  However, in the present embodiment, stepped portions 143a and 143b are provided on the mating surfaces 141a and 141b of the wing portion A127a and the wing portion B127b, and a convex portion 145 is provided on the negative pressure surface 144 side of the wing portion B127b. Therefore, even if a force in the direction opposite to the rotation direction of the impeller 120 is applied to the pressure surface 154 of the wing portion A127a, the positions of the mating surfaces 141a and 141b do not shift. Further, since the circumferential alignment surfaces 146a and 146b of the stepped portions 143a and 143b are configured so as to be combined with a substantially vertical surface without providing a taper, the force applied to the pressure surface 154 of the wing portion A127a is rotated. Since it is difficult to disperse in the axial direction with respect to the shaft 107, the mating surfaces 141a and 141b do not shift in the axial direction.

In particular, in the configuration in which the front shroud 122 and the fan case spacer 163 are in contact and sealed as in the present embodiment, the wing portion attached to the front shroud 122 and the front shroud 122 with an adhesive or the like by sliding friction. Since a force is applied to 127 in the direction opposite to the rotation direction of the impeller 120, the necessity of taking the above-described measures is increased.

  The air discharged from the impeller 120 flows into the air guide 161 and then flows into the bracket 105 of the electric motor 102 to cool the rotor portion 103 and the stator portion 104.

  Here, when the impeller 120 rotates, the sound pressure of the product frequency multiplied by the number of blades of the impeller 120 and the number of rotations increases, so that a sound uncomfortable for the user, Keen, is generated. In particular, when the number of blades and the number of rotations are small, for example, when the number of blades is 6 and the number of rotations is 600 r / s, the sound pressure at a frequency of 3.6 kHz increases, but the human ear has a frequency of 3 to 4 kHz. Because the frequency sound is particularly sensitive, it feels harsh. However, in this embodiment, since the number of blades is nine, the frequency at which the sound pressure increases at the same rotational speed is 5.4 kHz, which can reduce annoying noise.

  As described above, in this embodiment, the inducer 125 is composed of two upper and lower parts, the hub portion A 126a is inserted into the outer periphery of the cylindrical portion 149 of the hub portion B 126b, and the inducer is inserted from the upper portion of the cylindrical portion 149 by the nut 112. B125b is fixed to the rotating shaft 107, and the upper surface 152 of the hub portion A126a is disposed so as to be covered close to the lower surface 153 of the nut 112, whereby the impeller 120 is attached to the rotating shaft 107 with the nut 112. When fixing with a fastening body such as the above, it is possible to prevent a tightening force from being applied only to the inducer A125a, and the inducer A125a can be configured to be thin. It is possible to realize a multi-blade of the resin inducer 125 that can be produced.

  The inducer B125b is fixed to the rotating shaft 107 with a nut 112, and the inducer A125a is provided with means for preventing or restricting movement in both the rotating shaft 107 direction and the circumferential direction of the rotating shaft 107. It is possible to avoid the problem that the air flow is disturbed due to the deviation of the wing part A127a and the blowing performance is reduced.

  In this embodiment, the inducer 125 is composed of two upper and lower parts. However, when the number of blades of the inducer 125 is further increased, it may be composed of three or more upper and lower parts. Even in this case, since it is possible to make thin parts other than the lowest inducer part, the resin inducer 125 can be molded with a simple mold structure.

(Embodiment 2)
8 and 9 show the inducer 201 according to the second embodiment of the present invention.

  This embodiment is different from the first embodiment in that stepped step portions 204a provided on the mating surfaces 203a and 203b of the wing portion 202a of the inducer A 201a and the wing portion 202b of the inducer B 201b, Of 204b, some of the stepped portions 205a and 205b are configured such that a convex portion 207 is provided on the pressure surface 206 side of the wing portion B202b. Others are the same as those of the first embodiment, and the same numbers are assigned and detailed description is omitted.

  In the present embodiment, since the positions of the convex portions of some of the stepped portions 205a and 205b are reversed, when the assembly is performed, the inducer A 201a rotates with respect to the rotation direction indicated by the arrow Z with respect to the inducer B 201b. Since it is possible to regulate the positional deviation in both directions opposite to the direction, the loss due to the disturbance of the air flow caused by the assembly of the inducer A 201a and the inducer B is reduced. It is possible to increase the ventilation efficiency.

(Embodiment 3)
10 and 11 show the inducer 301 in the third embodiment.

  This embodiment is different from the first embodiment in that the outer surfaces of the wing portion B302b have a negative pressure surface on the mating surfaces 303a and 303b of the wing portion 302a of the inducer A301a and the wing portion 302b of the inducer B301b. First stepped portions 306a and 306b configured to have a convex portion 305 on the 304 side, and a second stepped portion 309a configured to have a convex portion 308 on the inner circumferential pressure surface 307 side of the wing portion B302b. 309b, and the length of the first stepped portions 306a and 306b in the radial direction is longer than the length of the second stepped portions 309a and 309b in the radial direction. Others are the same as those of the first embodiment, and the same numbers are assigned and detailed description is omitted.

  In the present embodiment, the first stepped portions 306a and 306b are provided on the mating surfaces 303a and 303b of the wing portions 302, respectively, and the second stepped portions 309a and 309b are provided at opposite positions. When assembling the inducer B301b, the first stepped portions 306a and 306b and the second stepped portions 309a and 309b are locked by the respective blade portions 302 so as not to be displaced from each other. And the wing B302b are not displaced and assembled.

  Further, unlike the second embodiment, the step portions 306a, 309a and 306b, 309b provided on the wing part A302a and the wing part B302b can be provided in the same shape for all the wings. Compared with the inducer 201 of the form 2, the molding accuracy can be improved.

  Here, the rotation of the impeller (not shown) causes the force applied to the pressure surface 307 of the wing 302 to be stronger on the outer peripheral side where the peripheral speed is faster. The first stepped portions 306a and 306b are configured to be longer than the second stepped portions 309a and 309b, so that the inducer A301a has an arrow Z with respect to the inducer B301b. Is prevented from shifting in the direction opposite to the rotation direction indicated by.

  As described above, it is possible to avoid the problem that the flow of air is disturbed due to the deviation between the inducer B301b and the inducer A301a and the blowing performance is reduced.

(Embodiment 4)
FIG. 12 shows a vacuum cleaner according to Embodiment 4 of the present invention.

  In FIG. 12, the vacuum cleaner 501 has a hose 502, an extension pipe 503, and a suction tool 504 that sucks dust by moving on the floor surface. The vacuum cleaner main body 506 includes the first to third embodiments. The electric blower 507 having the inducer (not shown) shown in FIG.

  About the vacuum cleaner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the electric vacuum cleaner 501 is activated, the electric blower 507 blows air. Since the electric blower 507 is provided with an inducer (not shown) having a relatively large number of blades as shown in the first to third embodiments, the electric blower 507 reduces noise at a frequency that is unpleasant for the user. It is possible to prevent the ventilation performance from being reduced due to the shift of the inducer (not shown) during use, so the vacuum cleaner body is also very practical with low noise and strong suction. Become.

  As described above, the electric blower according to the present invention and the vacuum cleaner using the electric blower are configured by the upper and lower parts of the inducer, and the cylindrical portion of the hub portion a is inserted into the outer periphery of the cylindrical portion of the hub portion B. The inducer B is fixed to the rotating shaft by a nut from the upper part of the cylindrical part, and the impeller is arranged so that the upper surface part of the hub part A is covered close to the lower surface part of the nut. When fastening with a fastening body such as a nut, it is possible to prevent a tightening force from being applied only to the inducer A, and it is possible to make the inducer A thin. It is possible to realize a multi-blade resin inducer that can be mass-produced with

  The inducer is fixed to the rotating shaft with a nut, and the inducer A is provided with means for preventing or restricting movement in both the rotating shaft direction and the circumferential direction of the rotating shaft. Therefore, it is possible to avoid the problem that the air flow is disturbed and the air blowing performance is reduced. Therefore, the present invention can be applied not only to home use but also to business equipment.

DESCRIPTION OF SYMBOLS 101 Electric blower 102 Electric motor 107 Rotating shaft 112 Nut (fastened body)
120 Impeller 121 Rear shroud 122 Front shroud 123 Blade 124 Air inlet 125 Inducer 125a Inducer A
125b Inducer B
126 Hub portion 126a Hub portion A
126b Hub part B
127 Wings 127a Wings A
127b Wing B
141a Mating surface 141b Mating surface 143a Stepped portion (engagement portion)
143b Step part (engagement part)
144 Negative pressure surface 145 Convex part 147a Tapered part 147b Tapered part 148a Engaging part 148b Engaging part 152 Upper surface part 153 Lower surface part 201 Inducer 201a Inducer A
201b Inducer B
202a Wing A
202b Wing B
203a Mating surface 203b Mating surface 204a Step part (engagement part)
204b Step part (engagement part)
205a Step part (engagement part)
205b Step part (engagement part)
206 Pressure surface 207 Convex part 301 Inducer 301a Inducer A
301b Inducer B
302a Wing A
302b Wing B
303a mating surface 303b mating surface 304 negative pressure surface 305 convex portion 306a first step portion (engagement portion)
306b First step portion (engagement portion)
307 Pressure surface 308 Convex portion 309a Second step portion (engagement portion)
309b Second step portion (engagement portion)
501 Electric vacuum cleaner 507 Electric blower

Claims (7)

An electric motor having a rotating shaft, an impeller that is rotationally driven by the electric motor, and the impeller includes a front shroud having an air inlet, a rear shroud spaced from the front shroud, and the pair of shrouds A plurality of sheet metal blades sandwiched between and a resin inducer that is provided at the center of the impeller and has a substantially conical hub portion and a plurality of wing portions around it, and rectifies the intake airflow And consisting of
The inducer is divided into two parts on a plane substantially perpendicular to the rotating shaft of the electric motor, and the upstream inducer A includes a substantially ring-shaped hub portion A and a plurality of blade portions A. Configured,
The downstream inducer B is composed of a substantially conical hub portion B and a plurality of wing portions B.
The wing portion B and the wing portion A are provided with engaging portions for mating each other on the mating surfaces, and the hub portion A is inserted into the outer periphery of the hub portion B and fastened from above the hub portion B. By fixing the inducer B to the rotating shaft by a body, the wing part B and the wing part A are connected by the engaging part,
The inducer A is arranged such that the outer wing tip of the wing part A is arranged close to the front shroud, and the upper surface part of the hub part A is covered close to the lower surface part of the fastening body. An electric blower in which movement in the direction of the rotation axis is regulated by being arranged. The electric blower according to claim 1, wherein the engaging portion is a stepped portion configured such that a convex portion is provided on the suction surface side in the wing portion B. The electric blower according to claim 2, wherein a part of the engaging portion is a stepped portion configured such that a convex portion is provided on the pressure surface side in the wing portion B. The engaging portion includes a first step portion configured such that a convex portion is provided on the suction surface side on the outer peripheral side in the wing portion B, and a convex portion is provided on the pressure surface side on the inner peripheral side in the wing portion B. The electric blower according to claim 1, wherein the electric blower is a configured second stepped portion. The electric blower according to any one of claims 1 to 4, wherein a mating surface of the engaging portion in a circumferential direction with respect to the rotation axis is configured to be substantially vertical. An uneven engagement portion having a tapered portion is formed on the mating surface in the rotation axis direction of the hub portion A and the hub portion B, and the upper end surface is higher than the engagement portion provided on the mating surface of the wing portion A and the wing portion B. The electric blower of any one of Claims 1-5 provided so that it might become high. The vacuum cleaner which has an electric blower of any one of Claims 1-6.